Camshaft, Hydraulic Roller Tappet, Advertised Duration 283/303, Lift .513/.498, Chevy, Small Block, Each

Cam Style:

Hydraulic roller, OE roller

Camshaft Use:

Street/Strip

Basic Operating RPM Range:

1,900-5,600

Intake Duration at 050 inch Lift:

227

Exhaust Duration at 050 inch Lift:

241

Duration at 050 inch Lift:

227 int./241 exh.

Advertised Intake Duration:

283

Advertised Exhaust Duration:

303

Advertised Duration:

283 int./303 exh.

Intake Valve Lift with Factory Rocker Arm Ratio:

0.513 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio:

0.498 in.

Valve Lift with Factory Rocker Arm Ratio:

0.513 int./0.498 exh.

Lobe Separation (degrees):

107

Camshaft Gear Attachment:

3-bolt

Computer-Controlled Compatible:

No

Grind Number:

283THR7

Valve Springs Required:

Yes

Quantity:

Sold individually.

COMP Cams Thumpr Hydraulic Roller Camshafts

COMP Cams has awakened the muscle car sound--and it is nastier than ever! Thumpr Series camshafts is a line of cutting-edge hydraulic roller camshafts for engines originally equipped with flat tappet cams. With them, you can expect a substantial power increase without sacrificing reliability or ease of maintenance! The lobe profile and grind characteristics of Thumpr cams include blending an early exhaust valve opening, a long exhaust duration, and a generous amount of intake and exhaust overlap. This maximizes rough-idling tendencies, delivering a seriously aggressive exhaust note without affecting engine power output. Thumpr camshafts are available in a variety of grind profiles, each producing impressive horsepower and torque performance within a different rpm range.